We look at the division of 77021 by 20 
We want to divide 77021 by 20.

On to step 1:
When dividing 7 by 20, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 20

Let's proceed to step 2:
When dividing 77 by 20, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 60 from 77 leaves us with 17.
Bring next digit (0) of the dividend behind the 17 and repeat the process: 170 / 20

Step 3:
When dividing 170 by 20, we get 8 with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
Subtracting 160 from 170 leaves us with 10.
Take the next digit (2) from the dividend and append it to 10, then repeat: 102 / 20

On to step 4:
If we divide 102 by 20, we get 5 and a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 385.0
The remainder is 2 after subtracting 100 from 102.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 20

Advancing to step 5:
21 divided by 20 is 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 3851.0
Subtract 20 from 21 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 6:
If we divide 10 by 20, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 3851.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 7:
20 goes into 100 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 3851.05
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3851.05
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
0 divided by 20 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 3851.05
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 3851.05 and a remainder of 0.0.